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|
/**
* --------------------------------------------------------------------------
* Bootstrap (v4.3.1): dom/polyfill.js
* Licensed under MIT (https://github.com/twbs/bootstrap/blob/master/LICENSE)
* --------------------------------------------------------------------------
*/
import {
getUID
} from '../util/index'
/* istanbul ignore next */
const Polyfill = (() => {
// MSEdge resets defaultPrevented flag upon dispatchEvent call if at least one listener is attached
const defaultPreventedPreservedOnDispatch = (() => {
const e = new CustomEvent('Bootstrap', {
cancelable: true
})
const element = document.createElement('div')
element.addEventListener('Bootstrap', () => null)
e.preventDefault()
element.dispatchEvent(e)
return e.defaultPrevented
})()
let find = Element.prototype.querySelectorAll
let findOne = Element.prototype.querySelector
const scopeSelectorRegex = /:scope\b/
const supportScopeQuery = (() => {
const element = document.createElement('div')
try {
element.querySelectorAll(':scope *')
} catch (error) {
return false
}
return true
})()
if (!supportScopeQuery) {
find = function (selector) {
if (!scopeSelectorRegex.test(selector)) {
return this.querySelectorAll(selector)
}
const hasId = Boolean(this.id)
if (!hasId) {
this.id = getUID('scope')
}
let nodeList = null
try {
selector = selector.replace(scopeSelectorRegex, `#${this.id}`)
nodeList = this.querySelectorAll(selector)
} finally {
if (!hasId) {
this.removeAttribute('id')
}
}
return nodeList
}
findOne = function (selector) {
if (!scopeSelectorRegex.test(selector)) {
return this.querySelector(selector)
}
const matches = find.call(this, selector)
if (typeof matches[0] !== 'undefined') {
return matches[0]
}
return null
}
}
return {
defaultPreventedPreservedOnDispatch,
find,
findOne
}
})()
export default Polyfill
|
